I upgrade an old dwarf chassis to 10" springs (hypercoil) which ended up being a hassle due to where I needed to mount the tops of the coil overs. I picked up a new car running 8" springs and Im fine with them, I havent had a chance to weigh my old springs as compared to the 8" but there should be a weight savings per spring of a couple of coils. You can get good springs for both 10 and 8, but if you are running dwarf cars on dirt you might want to talk to them as they may run 10" for coil bind issues. If its asphalt, 8" should work fine and be lighter.